The US forced Japan's surrender with nuclear weapons.
I already made that point in previous posts, and it does nothing to negate the island-hopping campaign of WW2. In pretty all cases, the islands being assaulted had a much, much wider gulf of water between them and were extremely well-fortified.
In terms of number of vessels - yes, China has padded its numbers by fielding a great number of smaller patrol vessels with very little combat capability. In terms of tonnage the US Navy's 4.6 million dwarves the Chinese Navy's 2 million. In terms of large capital ships they are sorely lacking. China has 2 aircraft carriers. The US has 11 carriers - with the capability of pulling some more out of retirement if needed (and several other smaller vessels with aircraft launch capabilities that we don't consider full carriers).
First of all, they are not smaller patrol vessels with very little combat capability. What would be the purpose of a patrol amphibious assault ship? They are not (currently) building carrier groups to project power to the other side of the globe. Aircraft carriers tend to be bigger than amphibious assault ships, submarines, and corvettes. The latter type of ships (China's focus) are ideal for amphibious assaults and controlling shallow waters (like the Chinese coast and South China Sea). They are building ships to assault Taiwan (and some other islands they lay claim to as well, but Taiwain is the big prize). Why on earth would they need massive carrier groups or "floating barges" to launch planes from when they routinely invade Taiwan's airspace from the mainland?
Our military spending outstrips theirs by multiple factors too, and if it came down to nukes our nuclear arsenal is significantly larger.
Our military spending....I can tell you from personal experience, that money is spent extremely poorly. The amount of waste, fraud and abuse is staggering. And even if it wasn't, the general aim of that of spending is to project power across the globe, not to invade an island off the coast and defend your own territory.
China is not (currently) looking to invade countries across the globe, but the CCP wants Taiwan more than anything else in the world, and they have always demonstrated a willingness to use force to achieve their goals. This is not news.
China is also not likely to have any allies in such a conflict. The US would likely have Japan, Australia, and the UK at a minimum.
First, God bless the Brits and Aussies (and Canadians). Japan has only recently expressed any kind of willingness to use their military for anything other than defensive purposes, and I would not count them as a reliable ally in terms of providing boots on the ground, although I did appreciate them sending combat medics to Afghanistan.
North Korea, Russia, Iran immediately come to mind as natural allies of China, and politics always makes strange bedfellows.
China trying to take Taiwan is a losing bid. Heck the only reason we acknowledge the "one China" policy is because we can slyly make them shut up but in the US's eyes there IS only one China - and its government is in Taipei not Beijing.
Well, that is not what the official US policy is.
China certainly has never shut up about this.
And you can help defend that government in Taipei, because no one else in their right mind is going to.